More accurately is there anything extra you would do while replacing the valley gasket on a V8?

Obviously change the anti-freeze and perhaps the serpentine belt. My RR is a 4.6 2001 MY and has 112k on it and runs OK as far as I can tell. Did a check for faults on the Motronic fault code memory (Thor) and found these:

THE MOTRONIC FAULT CODE MEMORY CONTAINS CODES FOR THE FOLLOWING CURRENT FAULTS -:

P1000 = ADDITIVE ADAPTIVE MIXTURE CORRECTION TRA BANK 1 DRIVE CYCLE B, WHICH HAS OCCURED 35 TIMES

(SIGNAL TOO LOW, THE FAULT IS CURRENTLY PRESENT, THIS FAULT CAUSES MIL LAMP ACTIVATION, THE FAULT HAS BEEN DETERMINED AS INTERMITTENT).

P0175 = ADDITIVE ADAPTIVE MIXTURE CORRECTION TRA BANK 2 DRIVE CYCLE B, WHICH HAS OCCURED 28 TIMES

(SIGNAL TOO LOW, THE FAULT IS CURRENTLY PRESENT, THIS FAULT CAUSES MIL LAMP ACTIVATION, THE FAULT HAS BEEN DETERMINED AS INTERMITTENT).

P0175 = MIXTURE ADAPTION FACTOR FRA BANK 2 DRIVE CYCLE C, WHICH HAS OCCURED 191 TIMES

(SIGNAL TOO HIGH, THE FAULT IS CURRENTLY NOT PRESENT, THIS FAULT CAUSES MIL LAMP ACTIVATION, THE FAULT HAS BEEN DETERMINED AS INTERMITTENT).

P0172 = MIXTURE ADAPTION FACTOR FRA BANK 1 DRIVE CYCLE C, WHICH HAS OCCURED 123 TIMES

(SIGNAL TOO HIGH, THE FAULT IS CURRENTLY NOT PRESENT, THIS FAULT CAUSES MIL LAMP ACTIVATION, THE FAULT HAS BEEN DETERMINED AS INTERMITTENT).

Could these errors be caused by dirty / failing injectors? Or possibly MAF or other sensor issue?

How would you clean the injectors or send them away for cleaning / testing?

Thanks,

Carl....

Injectors tend to last longer than the rest of the engine, the fault codes suggest to me that the Lambdas might need looking at.

Peter

dirty or faulty maf sensor sounds like a good place to start, Petrol injectors are normally quite reliable but never say never, a pot of redex or similar injector cleaner would be cheaper alternative to removing and having them cleaned professionally, that's your choice..engine coolant sensor readings?

Good advice I'll get some cleaner for the MAF.

As I'll be taking the inlet manifold off to fix my leaky valley gasket I wondered if it was worth the extra effort to clean or get cleaned the injectors?

unless you feel the injectors need the attention? As I say it's your choice, a regular dose of cleaner in the tank and a good run out certainly goes a long way..

You can buy a can of MAF sensor cleaners, with reusable air filters (the kind you spray oil on) can get mucky quicker, And some Seafoam spray for the injectors pistons for carbon build up